What is a pruning saw and how do you use it? Our gardening expert advises

Woman pruning branches of a tree with a pruning saw.

The pruning saw is one of my must-have garden tools. They come into their own in fall and early winter when you're in one of the key pruning seasons of the year. 

These are lightweight tools designed to tackle wood that pruning shears and loppers would struggle with, but that are too thin for a bow saw or chain saw.